Does the wifi on the tablet take a while to shutdown after you power the machine totally off ?

I have noticed that my router lights keep flashing like mad even after the Tablet is shut down/powered off, the lights on the router act like something is still using the wifi connection but there is nothing using it and I also have it password protected too, so no one else is stealing my wifi connection either incase someone suggests that, lol.

I havent stood or sat down long enough to see if the lights on the router stop acting like some device is using the wifi connection after maybe 5 minutes or so, I have not took the time to sit and wait and check that.

But, I was thinking, maybe even though the Tablet is powered off, "maybe" its wifi connection does not switch off until maybe something like 10 or 30 minutes or something like that, I dont know, does anyone ?

If so or if not, is there some settings I can change that will make sure the wifi connection from the tablet is cut off straight away or within a minute or two of powering the tablet Off ?

Please let me know a.s.a.p as little issues like this drive me nuts, lol.

p.s

I can get the lights on the router to stop flashing as if somethings using it by pulling the power cord out of it for a second and then plugging it back in, but I know myself thats not the correct thing to have to need to do, please advise.